If the slope is -1, this means that for every time you add 1 to X, you add -1 to (subtract one from) Y. So, the line would go down at an equal amount as it goes over. If the line crosses 0,0 then it would appear to cut the upper left and lower right quadrants in perfect triangular halves.
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Its exact appearance will depend on the scale used for the axes. If the scales are the same then the graph will be a straight line, going up from left to right, at an angle of 45 degrees.
It is a horizontal line that intersects the y axis at negative 1
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Solve the line equation for "y", to get it in slope-intercept form. You can immediately read the slope from this equation.Divide -1 by (slope of this first line) to get the slope of the second line - the one perpendicular to the given line. Write an equation for any line with this slope.
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